Abstract:
A study is made of the behaviour of the equatorial ionization anomaly m the Indian region on days with an abnormal S/subq (H) phase limited to the
electrojet belt. The anomaly is found to disappear or reduce in strength
quite consistently within about 2 hr of the onset of complete or partial
counter-electrojet conditions, responsible for the shift of the S/subq (H)
phase from the normal time interval Further, the remarkably poor development of the anomaly in the afternoon period In the Indian region as compared to that in the East Asian region has been shown to occur only on
days with an abnormal S/subq (H) phase m the Indian equatorial region.
These results lend further support to the View that the occurrence of an
abnormal S/subq (H) phase at electrojet locations is closely associated
with perturbations in the electrojet eclectic field.
